Selected Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (unaudited)

	First Quarter		Second Quarter (2)		Third Quarter		Fourth Quarter (3)		Total
	In millions, except per share data
2018
Total revenues	$	305.3	$	349.5	$	349.7	$	356.4	$	1,360.9
Net income	$	76.3	$	38.8	$	47.0	$	49.2	$	211.3
Per Share Data (1)
Basic	$	2.02	$	1.03	$	1.25	$	1.32	$	5.62
Diluted	$	1.98	$	1.01	$	1.22	$	1.30	$	5.52
2017
Total revenues	$	316.1	$	348.4	$	359.6	$	352.8	$	1,376.9
Net income	$	57.5	$	53.4	$	49.0	$	342.1	$	502.0
Per Share Data (1)
Basic	$	1.46	$	1.37	$	1.27	$	8.98	$	12.95
Diluted	$	1.44	$	1.35	$	1.25	$	8.83	$	12.75

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(1) Quarterly earnings per share may not be additive, as per share amounts are computed independently for each quarter and the full year is based on the respective weighted average common shares and common stock equivalents outstanding.

(2) In the second quarter of 2018, net income included $5.8 million of expense (net of income taxes) attributable to the closure of a maintenance facility.

(3) In the fourth quarters of 2018 and 2017, net income included $17.9 million and $315.9 million of income tax benefits, primarily related to the impacts of the enacted Tax Act.